Privacy Policy

Last updated: March 2026

Who We Are

Skin Overdraft is a book by Rolf. This website (skin-insights.co) is operated by Cultur3 Numomo AG (CHE-400.275.415), Talbachstrasse 2, 8418 Schlatt ZH, Switzerland. Contact: legal@rolfskincare.com.

What We Collect

When you sign up for email updates, we collect:

Email address — to send you the free chapter and book updates
Signup date and source — to understand which pages led to signups (e.g. UTM parameters from ads)
Download activity — when you download the free chapter, we log the download timestamp, your browser's user-agent string, and which version of the chapter was served. This helps us track delivery success and improve the content.

We do not collect names, payment information, or browsing behavior beyond what is described below.

How We Use Your Data

Send you the free chapter you requested
Notify you when Skin Overdraft launches
Occasionally share evidence-based skincare insights (no more than 2 emails/month)

We will never sell, rent, or share your email address with third parties for their own marketing purposes.

Lawful Basis

We process your personal data based on your consent, given when you voluntarily submit the email signup form. You may withdraw consent at any time by unsubscribing or contacting us. Applicable data protection law: Swiss Federal Act on Data Protection (FADP/nDSG). If you are in the EU, GDPR also applies.

Data Processors

We use the following third-party services to operate this website. Each processes your data solely on our behalf:

Brevo (brevo.com) — email delivery and contact management. Privacy Policy
Turso (turso.tech) — database hosting (stores your email and signup data). Privacy Policy
Vercel (vercel.com) — website hosting. Privacy Policy

International Data Transfers

Our data processors (Brevo, Turso, Vercel) may process data outside Switzerland. These transfers are covered by the processors' standard contractual clauses and data processing agreements. Switzerland has been recognized by the EU as providing adequate data protection.

Cookies & Tracking

This site uses only essential storage:

cookie-consent — remembers your cookie preference (localStorage, not a cookie)

We do not use any analytics cookies or third-party tracking pixels.

Data Retention

We retain your email address and signup data for 24 months after your last interaction (email open, click, or signup). After that period, your data is deleted. ARC (advance reader) data is deleted 6 months after the book launch unless you separately opt into the general mailing list.

Your Rights

Under the Swiss Federal Act on Data Protection (FADP), you have the right to:

Unsubscribe at any time via the one-click link in every email
Access your data — request a copy of all data we hold about you
Correction — have inaccurate data corrected
Request deletion — have all your data permanently removed
Data portability — receive your data in a machine-readable format
Restriction — request that we limit how your data is processed
Lodge a complaint with your local data protection authority

To exercise any of these rights, email legal@rolfskincare.com. We will respond within 30 days.

Data Storage & Security

Your data is stored in a database hosted on Turso (edge-distributed SQLite). Data is encrypted in transit (TLS) and at rest. Access is restricted to authenticated API endpoints only.

Changes

If we update this policy, we'll note the date above. Material changes will be communicated via email to active subscribers.